Q: Is 21,120 a Prime Number?
A: No, 21,120 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 21120 can be evenly divided by 1 2 3 4 5 6 8 10 11 12 15 16 20 22 24 30 32 33 40 44 48 55 60 64 66 80 88 96 110 120 128 132 160 165 176 192 220 240 264 320 330 352 384 440 480 528 640 660 704 880 960 1,056 1,320 1,408 1,760 1,920 2,112 2,640 3,520 4,224 5,280 7,040 10,560 and 21,120, with no remainder.
Since 21,120 cannot be divided by just 1 and 21,120, it is not a prime number.